eField Exploration LLP has announced the completion of their first Offshore Airborne Survey -- a powerful new "De-Risking Tool" for the Oil & Gas Exploration Industry. Contracted by a Norwegian JV, the survey in the Nordland area of the Norwegian Sea was used to rapidly assess the potential of multiple blocks for the Norwegian Petroleum Directorate's 20th Licensing Round.
Flying over 100 miles offshore and over water up to 1000 feet deep, Passive Electromagnetic and High Resolution Magnetic data acquisition was completed in less than one week with a specially designed sensor package.
"Conventional methods such as Marine Seismic or CSEM would have taken months and costs would have been prohibitive," said Ed Johnson, president of eField. "Our Offshore Airborne System can cover up to 500 line miles per day at a fraction of the cost of a marine survey."
Johnson further noted that "eField's platform incorporates multiple sensors including high resolution magnetics and electromagnetics recording data from the air-ocean interface to sub-floor penetration. Satellite data is then added to provide valuable natural seep mapping.
eField’s EMT System
eField's new generation of airborne Electro-Magnetotelluric technology leverages advances in airborne geophysics, remote sensing, and forward modeling.
The underlying technology of the eField system detects the presence of hydrocarbons by reading natural electric currents known as Telluric currents. Telluric currents are induced by solar energy and lightning that penetrate deep into the earth. eField's airborne system captures resultant resistivity and polarization changes that occur at the interface of water and dissolved hydrocarbons and in the sea bed.
This approach is significantly different than technologies that rely on spectral imaging, gravity, or magnetic measurements. These and other indirect measurement systems, like seismic, require time consuming data gathering and interpretation methodologies that identify anomalies or prospects which may or may not contain oil or gas. Oil and Gas are natural insulators -- they have high resistivity compared to water. This differentiation allows eField to model and accurately identify anomalies where hydrocarbons may be present at depths of 20,000 feet or more below the ocean floor and in natural seep columns that percolate to the surface.